Coil Multi-Cooling Path Drive Motor Oil Scattering
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Solution Overview
Problem
The existing oil cooling method for drive motors in eco-friendly vehicles is inefficient as it primarily scatters oil on the front of the coil, leading to non-uniform cooling performance and requiring significant effort to control temperature, with limited effectiveness in cooling the rear of the coil.
Innovation Solution
A coil multi-cooling path system that includes a coil cooling path, an engine clutch cooling path, and a resolver cooling path, where oil is scattered in both forward and backward directions across the width of the rotor sleeve, with oil flowing to the engine clutch and resolver to enhance cooling efficiency by ensuring uniform distribution across the coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single scattering cooling path is used in the oil cooling method, then the structure is simple, but the cooling performance is insufficient and non-uniform
Solution Approach 1:
The single scattering cooling path is divided into multiple cooling paths (first scattering cooling path and second scattering cooling path) positioned at different locations. This segmentation allows oil to be scattered at multiple positions, improving cooling uniformity across the coil while maintaining reasonable structural complexity
Solution Approach 2:
Different scattering cooling paths are positioned at specific locations to address local cooling needs. The first scattering cooling path cools one region of the coil while the second scattering cooling path cools another region, ensuring each area receives adequate cooling based on its specific thermal requirements
2Device complexity
If oil is scattered only on the front of the coil, then the cooling path is simple, but the cooling uniformity is poor
Solution Approach 1:
The cooling system transitions from one-dimensional (front-only scattering) to three-dimensional cooling by adding scattering paths at multiple positions and orientations. This allows oil to reach the coil from different directions (front, rear, and intermediate positions), achieving uniform temperature distribution throughout the coil volume
3Reliability
If multiple scattering cooling paths are added to improve cooling uniformity, then the cooling performance is enhanced, but the device complexity increases
Solution Approach 1:
The rotor sleeve structure serves multiple functions: it acts as both a structural component and a cooling distribution system. The scattering cooling paths are integrated into the existing rotor sleeve, allowing it to simultaneously maintain mechanical integrity and distribute cooling oil through multiple paths, thereby improving cooling performance without proportionally increasing overall device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution significantly improves cooling performance by ensuring uniform cooling of the coil, reducing the effort required to control motor temperature and enhancing motor durability through effective three-dimensional oil scattering, thereby optimizing the cooling efficiency of the drive motor.
Implementation Method 1
oil collected by centrifugal force of a rotor flows to an engine clutch from an internal space of a rotor sleeve
Data Source
AI summary
A drive motor is provided in which a coil is cooled in a three-dimensional manner. The drive motor includes a coil multi-cooling path through which oil collected by centrifugal force of a rotor flows to an engine clutch from an internal space of a rotor sleeve to be scattered in forward and backward directions of a coil and simultaneously flows to a resolver from an external space of the rotor sleeve to be scattered in the backward direction of the coil.